November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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you are here 4 257
quadrilaterals
How much should you charge for maintaining this lawn? We’ve
added in some extra measurements to help you.
Don’t forget that you’ll still need to edge round the flower bed,
even though you aren’t mowing it.
30 meters
20 meters
10.25 meters
3.75 meters
4.5 meters
13 meters
Watch out for the flowers when
you’re edging, they’re expensive!.
Use diagonals to find the area of the kite
Just like the parallelogram, there’s a shortcut we can take to find the area
of a kite. All we need to do is multiply the lengths of the two diagonals
together, and divide by 2:
Kite Area = 1/2 (diagonal 1 × diagonal 2)
Diagonal 1
Diagonal 2
Diagonal 2 is the base
1/2 Diagonal 1
(the height)
258 Chapter 6
sharpen solution
How much should you charge for maintaining the lawn? We’ve
added in some extra measurements to help you.
Don’t forget that you’ll still need to edge round the flower bed,
even though you aren’t mowing it.
30 meters
20 meters
10.25 meters
3.75 meters
4.5 meters
13 meters
Area of rectangle = 20 x 30
= 600 meters
2
Perimeter of rectangle = (2 x 20) + (2 x 30)
= 40 + 60
= 100 meters
Area of kite = 1/2 (4.5 x 13)
= 1/2 (58.5)
= 29.25 meters
2
Perimeter of kite = (2 x 3.75) + (2 x 10.25)
= 7.5 + 20.5
= 28 meters
Total area to maintain = 600 - 29.25
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